LG optimus L90 Guia Del Usuario página 48

• Environmental Protection Agency
• Occupational Safety and Health Administration
• National Telecommunications and Information Administration
The National Institutes of Health participates in some interagency working group activities, as well.
The FDA shares regulatory responsibilities for wireless phones with the Federal Communications Commission
(FCC). All phones that are sold in the United States must comply with FCC safety guidelines that limit RF exposure.
The FCC relies on the FDA and other health agencies for safety questions about wireless phones.
The FCC also regulates the base stations that the wireless phone networks rely upon. While these base stations
operate at higher power than do the wireless phones themselves, the RF exposures that people get from these
base stations are typically thousands of times lower than those they can get from wireless phones. Base stations
are thus not the subject of the safety questions discussed in this document.
3. What kinds of phones are the subject of this update?
The term "wireless phone" refers here to handheld wireless phones with built-in antennas, often called "cell",
"mobile", or "PCS" phones. These types of wireless phones can expose the user to measurable Radio Frequency
(RF) energy because of the short distance between the phone and the user's head.
These RF exposures are limited by FCC safety guidelines that were developed with the advice of the FDA and
other federal health and safety agencies. When the phone is located at greater distances from the user, the
exposure to RF is drastically lower because a person's RF exposure decreases rapidly with increasing distance
from the source. The so-called "cordless phones," which have a base unit connected to the telephone wiring in a
house, typically operate at far lower power levels, and thus produce RF exposures far below the FCC safety limits.
4. What are the results of the research done already?
The research done thus far has produced conflicting results, and many studies have suffered from flaws
in their research methods. Animal experiments investigating the effects of Radio Frequency (RF) energy
exposures characteristic of wireless phones have yielded conflicting results that often cannot be repeated in
other laboratories. A few animal studies, however, have suggested that low levels of RF could accelerate the
development of cancer in laboratory animals. However, many of the studies that showed increased tumor
development used animals that had been genetically engineered or treated with cancer-causing chemicals so as
to be pre-disposed to develop cancer in the absence of RF exposure. Other studies exposed the animals to RF
for up to 22 hours per day. These conditions are not similar to the conditions under which people use wireless
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